JPH0517737A - Metal substrate graphite gasket - Google Patents
Metal substrate graphite gasketInfo
- Publication number
- JPH0517737A JPH0517737A JP16984091A JP16984091A JPH0517737A JP H0517737 A JPH0517737 A JP H0517737A JP 16984091 A JP16984091 A JP 16984091A JP 16984091 A JP16984091 A JP 16984091A JP H0517737 A JPH0517737 A JP H0517737A
- Authority
- JP
- Japan
- Prior art keywords
- elastomer
- gasket
- sheet
- expanded graphite
- metal substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Gasket Seals (AREA)
- Sealing Material Composition (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車のシリンダヘッ
ドや油まわりのシールに用いられるガスケットに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket used for a cylinder head of an automobile or a seal around oil.
【０００２】[0002]
【従来の技術】従来、上記した用途には鋼板等の心板の
両面に、石綿とエラストマーとの混合物からなるシート
を固着したものが多用されてきた。しかし、石綿は人体
に有害であるので使用が制限されつつあり、石綿の代替
としてアラミド繊維を用いること等が検討されている。2. Description of the Related Art Conventionally, a core plate such as a steel plate to which a sheet made of a mixture of asbestos and an elastomer is adhered has been widely used for the above-mentioned applications. However, since asbestos is harmful to the human body, its use is being restricted, and the use of aramid fiber as a substitute for asbestos is being studied.
【０００３】[0003]
【発明が解決しようとする課題】ところが、石綿及びア
ラミド繊維の何れの場合も、繊維を用いるとシート内に
開気孔が多数残留するため、充分なシール性が得られな
いという欠点がある。また、シール性を高めるためにエ
ラストマーを増加させると耐熱性が悪化し、もはやシリ
ンダヘッド等のガスケットとしては使用出来ない。他
方、エラストマーや樹脂等の接着剤を用いずに、密着性
を高めるために、心板に網状のものやフック板と称する
ものを用いたうえ、繊維とエラストマーとの混合物の代
りに黒鉛を圧着したガスケットが用いられている。この
黒鉛圧着ガスケットは開気孔が無く、接触面圧が低い場
合でも極めて良好なシール性を有し、エラストマー等が
全く含まれていないので耐熱性にも優れるという特長を
持っている。しかし、黒鉛シート層が脆くて機械的強度
が低いので傷つきやすく、また、水や油等に長時間浸漬
しておくとシート端部が崩れてくるという欠点がある。However, in both asbestos and aramid fibers, the use of fibers has a drawback in that a large number of open pores remain in the sheet, so that sufficient sealing properties cannot be obtained. Further, if the amount of elastomer is increased to improve the sealing property, the heat resistance deteriorates, and it can no longer be used as a gasket for a cylinder head or the like. On the other hand, instead of using an adhesive such as an elastomer or resin, to improve the adhesion, use a mesh-shaped core plate or what is called a hook plate, and press-fit graphite instead of the mixture of fiber and elastomer. Used gasket. This graphite pressure-bonded gasket has no open pores, has an extremely good sealing property even when the contact surface pressure is low, and has an excellent heat resistance because it contains no elastomer or the like. However, since the graphite sheet layer is fragile and has low mechanical strength, it is easily scratched, and if it is immersed in water, oil, etc. for a long time, the sheet end portion will collapse.
【０００４】本発明は、上記した従来材の問題点を解消
するものであり、シール性、耐水性及び耐油性の全てに
優れる、鋼板等の心板を用いた黒鉛質のガスケットを提
供することを目的とする。The present invention solves the above problems of conventional materials, and provides a graphite gasket using a core plate such as a steel plate, which is excellent in sealing property, water resistance and oil resistance. With the goal.
【０００５】[0005]
【課題を解決するための手段】本発明は、金属板の片面
又は両面に、５〜３０重量％のエラストマーを含有する
膨張黒鉛をかさ密度０．７ｇ／cm3以上のシート状に形
成してなる金属基板黒鉛質ガスケットに関する。According to the present invention, expanded graphite containing 5 to 30% by weight of elastomer is formed on one or both sides of a metal plate in a sheet shape having a bulk density of 0.7 g / cm 3 or more. The present invention relates to a metal substrate graphite gasket.
【０００６】本発明において、金属板は従来から使用さ
れているＳＰＣＣ材やＳＵＳ材を使用し、厚さ及び形状
には特に制限はない。原料膨張黒鉛も公知の方法で得ら
れたものが使用され、膨張化率は大きいほうが強度的に
好ましいが特に制限はない。膨張黒鉛に複合するエラス
トマーは天然ゴム、ＳＢＲ、ＮＢＲ、ＣＲ、フッソゴム
等のゴムであり、ゴム単体からなるシートを熱圧成形し
たときに伸び率が１００％以上となるように、硫黄等の
加硫剤及びチウラム等の加硫促進剤を加えることが好ま
しい。複合するエラストマーの量が５重量％未満である
と、膨張黒鉛粒子を結合する結合材の絶対量が不足する
ため、機械的強度の向上が不充分であると共に、膨張黒
鉛粒子特にシートと垂直方向に切断された端面からの水
や油の浸入を防止出来ない。また、エラストマーの量が
３０重量％を越えると、耐熱性が石綿又はアラミド繊維
とエラストマーとの混合物からなる従来材並みになって
しまう。膨張黒鉛原料のかさ密度は元来約０．０２ｇ／
cm3以下と極めて低いため、加圧成形して高密度のシー
トとされるが、このシートのかさ密度はシール性と機械
的強度の点から０．７ｇ／cm3以上にすることが必要で
ある。In the present invention, as the metal plate, SPCC material or SUS material which has been conventionally used is used, and the thickness and shape are not particularly limited. As the raw material expanded graphite, one obtained by a known method is used, and a higher expansion coefficient is preferable in terms of strength, but there is no particular limitation. The elastomer compounded with the expanded graphite is a rubber such as natural rubber, SBR, NBR, CR, and fluorine rubber, and is added with sulfur or the like so that the elongation rate becomes 100% or more when a sheet made of a single rubber is thermocompression molded. It is preferable to add a vulcanization accelerator such as a vulcanizing agent and thiuram. If the amount of the composite elastomer is less than 5% by weight, the absolute amount of the binder that bonds the expanded graphite particles is insufficient, so that the mechanical strength is insufficiently improved, and the expanded graphite particles, especially in the direction perpendicular to the sheet. It is not possible to prevent the infiltration of water or oil from the end face cut into the edges. On the other hand, when the amount of the elastomer exceeds 30% by weight, the heat resistance becomes equal to that of the conventional material composed of a mixture of asbestos or aramid fiber and the elastomer. The bulk density of expanded graphite raw material is originally about 0.02 g /
Since it is extremely low (cm 3 or less), it is formed into a high-density sheet by pressure molding, but the bulk density of this sheet must be 0.7 g / cm 3 or more from the viewpoint of sealability and mechanical strength. is there.
【０００７】膨張黒鉛へのエラストマーの複合は、エラ
ストマーを有機溶剤に溶解した溶液又はラテックス（ゴ
ムのエマルジョン）に膨張黒鉛を浸漬するか膨張黒鉛に
エラストマー溶液等を含浸後乾燥して有機溶剤又は水分
を除去する等の方法による。次いでこのエラストマー含
有膨張黒鉛を、金属板の片面又は両面にプレス又はロー
ルを用いてシート状に圧着成形し、シート密度を高める
と同時に金属板に固着させる。エラストマーの加硫又は
硬化を上記成形と同時に行う場合は、例えば１５０℃程
度に加熱しながら成形する。但し、成形後に加熱して加
硫又は硬化を別工程で行ってもよい。なお、金属板とシ
ートとの固着をより強固にするために、あらかじめ金属
板にエラストマー又は樹脂等の接着剤を塗布しておいて
も良い。The composite of the elastomer with the expanded graphite is prepared by immersing the expanded graphite in a solution or latex (emulsion of rubber) in which the elastomer is dissolved in an organic solvent, or by impregnating the expanded graphite with the elastomer solution or the like and drying it. And the like. Next, this elastomer-containing expanded graphite is press-molded on one side or both sides of a metal plate into a sheet by using a press or a roll to increase the sheet density and at the same time to be fixed to the metal plate. When the elastomer is vulcanized or cured at the same time as the above-mentioned molding, the molding is carried out while heating at about 150 ° C., for example. However, vulcanization or curing may be performed in a separate step by heating after molding. In addition, an adhesive such as an elastomer or a resin may be applied to the metal plate in advance in order to strengthen the adhesion between the metal plate and the sheet.
【０００８】[0008]
【実施例】次に本発明の実施例を説明する。EXAMPLES Next, examples of the present invention will be described.
【０００９】実施例１ ＮＢＲラテックス（日本ゼオン製、Ｎippol１５７１）
をゴム成分が１０重量％となるように水で希釈した液９
９重量部に、加硫剤として硫黄粉及び加硫促進剤として
テトラメチルチウラムジスルフィド粉を各々０．５重量
部加えて混合した。この混合物１００重量部にかさ密度
が０．０１ｇ／cm3の膨張黒鉛粉９０重量部を浸漬して
から水分を乾燥して、エラストマー含有膨張黒鉛を得
た。次に、２．５mmピッチで多数の円形突起を設けたＳ
ＵＳ−３０４、厚さ０．２mmの金属板の片面に上記エラ
ストマー含有膨張黒鉛を１ｍ2当り４５０ｇになるよう
に配し、プレスにより１５０℃で１０分間シート状に熱
圧成形した。成形後の金属板に固着したシートの厚みは
０．３mm、かさ密度は１．５ｇ／cm3であった。Example 1 NBR latex (Nippol1571 manufactured by Nippon Zeon Co., Ltd.)
Liquid 9 in which the rubber component was diluted to 10% by weight with water
To 9 parts by weight, 0.5 parts by weight of sulfur powder as a vulcanizing agent and 0.5 parts by weight of tetramethylthiuram disulfide powder as a vulcanization accelerator were added and mixed. 90 parts by weight of expanded graphite powder having a bulk density of 0.01 g / cm 3 was immersed in 100 parts by weight of this mixture, and the water was dried to obtain elastomer-containing expanded graphite. Next, S with a large number of circular protrusions at a pitch of 2.5 mm
US-304, a 0.2 mm-thick metal plate was placed on one surface thereof with the elastomer-containing expanded graphite in an amount of 450 g per 1 m 2, and was thermocompressed into a sheet at 150 ° C. for 10 minutes by a press. The thickness of the sheet adhered to the metal plate after forming was 0.3 mm, and the bulk density was 1.5 g / cm 3 .
【００１０】比較例１ 実施例１におけるエラストマーを含有させることなく、
膨張黒鉛をそのまま実施例１と同じ金属板に常温でシー
ト状にプレスで圧着成形し、シート部分の厚みが０．３
mm、かさ密度が１．３ｇ／cm3の金属基板の黒鉛質ガス
ケットを得た。Comparative Example 1 Without the inclusion of the elastomer of Example 1,
The expanded graphite was press-molded on the same metal plate as in Example 1 into a sheet at room temperature by pressing, and the thickness of the sheet portion was 0.3.
A graphite gasket having a metal substrate and a bulk density of 1.3 g / cm 3 was obtained.
【００１１】比較例２ 実施例１における膨張黒鉛に代えて市販の石綿を用い、
エラストマーを３０重量％とした以外は実施例１と同様
にしてシート部分の厚みが０．３mm、かさ密度が１．７
ｇ／cm3の金属基板のガスケットを得た。Comparative Example 2 Instead of the expanded graphite used in Example 1, commercially available asbestos was used.
The thickness of the sheet portion was 0.3 mm and the bulk density was 1.7 in the same manner as in Example 1 except that the elastomer content was 30% by weight.
A gasket having a metal substrate of g / cm 3 was obtained.
【００１２】比較例３ 実施例１における膨張黒鉛に代えて市販のアラミド繊維
２０重量％及び無機質粉末充填剤６０重量％を用い、エ
ラストマーを２０重量％とした以外は実施例１と同様に
してシート部分の厚みが０．３mm、かさ密度が１．６ｇ
／cm3の金属基板のガスケットを得た。Comparative Example 3 A sheet was prepared in the same manner as in Example 1 except that 20% by weight of a commercially available aramid fiber and 60% by weight of an inorganic powder filler were used instead of the expanded graphite in Example 1 and the elastomer was 20% by weight. Part thickness is 0.3mm and bulk density is 1.6g
A gasket of a metal substrate of / cm 3 was obtained.
【００１３】実施例及び比較例で得た各種ガスケットに
ついて、そのシール性、耐熱性、耐水性及び耐油性を測
定評価した。その結果を表１に示す。表中、シール性は
締め付け圧力８ＭＰａの場合のシール出来る液圧（ＭＰ
ａ）を示し、耐熱性はＡＳＴＭのＦ−３８法により測定
した応力緩和率（％）で表し、％の小さいほど優れてい
ることを示す。また、耐水性はロングライフクーラント
液に１００℃で５時間浸漬後の圧縮破壊強度（ＭＰ
ａ）、耐油性はＡＳＴＭのＮo.３オイル中に１００℃で
５時間浸漬後の圧縮破壊強度（ＭＰａ）を示す。The various gaskets obtained in Examples and Comparative Examples were measured and evaluated for their sealing property, heat resistance, water resistance and oil resistance. The results are shown in Table 1. In the table, the sealing property is the liquid pressure (MP
The heat resistance is represented by the stress relaxation rate (%) measured by the ASTM F-38 method, and the smaller the%, the better the heat resistance. Also, the water resistance is the compressive fracture strength (MP) after immersion in a long-life coolant at 100 ° C for 5 hours.
a), the oil resistance indicates the compressive fracture strength (MPa) after immersion in ASTM No. 3 oil at 100 ° C. for 5 hours.
【００１４】[0014]
【表１】表１ [Table 1] Table 1
【００１５】表１から、実施例１のガスケットは、シー
ル性及び耐熱性が比較例２及び３のものより優れ、比較
例１のガスケットとほぼ同等であり、耐水性及び耐油性
が比較例２及び３のガスケットと同等以上である。From Table 1, the gasket of Example 1 is superior in sealability and heat resistance to those of Comparative Examples 2 and 3, is almost equivalent to the gasket of Comparative Example 1, and has water resistance and oil resistance of Comparative Example 2. And the gasket of 3 or more.
【００１６】[0016]
【発明の効果】本発明の金属基板黒鉛質ガスケットは、
従来の石綿やアラミド繊維を用いたガスケットに比較し
てシール性及び耐熱性が極めて優れており、黒鉛と金属
心板だけからなるガスケットの欠点であった耐水性及び
耐油性が大幅に改良されたものである。The metal substrate graphite gasket of the present invention comprises:
Compared with conventional gaskets using asbestos and aramid fiber, the sealability and heat resistance are extremely superior, and the water resistance and oil resistance, which were the drawbacks of gaskets consisting only of graphite and metal core plate, have been greatly improved. It is a thing.
Claims (1)
％のエラストマーを含有する膨張黒鉛をかさ密度０．７
ｇ／cm3以上のシート状に形成してなる金属基板黒鉛質
ガスケット。Claims: 1. Expanded graphite containing 5 to 30% by weight of elastomer on one or both sides of a metal plate has a bulk density of 0.7.
Graphite gasket with metal substrate formed in a sheet shape of g / cm 3 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16984091A JPH0517737A (en) | 1991-07-10 | 1991-07-10 | Metal substrate graphite gasket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16984091A JPH0517737A (en) | 1991-07-10 | 1991-07-10 | Metal substrate graphite gasket |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0517737A true JPH0517737A (en) | 1993-01-26 |
Family
ID=15893903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16984091A Pending JPH0517737A (en) | 1991-07-10 | 1991-07-10 | Metal substrate graphite gasket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0517737A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004083690A1 (en) | 2003-03-17 | 2004-09-30 | Nippon Leakless Industry Co. Ltd. | Metal gasket for cylinder head |
| JP2007016976A (en) * | 2005-07-11 | 2007-01-25 | Uchiyama Mfg Corp | Gasket material and method of manufacturing gasket material |
| JP2016172750A (en) * | 2009-05-05 | 2016-09-29 | ユニバーシティ オブ フロリダ リサーチ ファウンデーション，インコーポレイテッド | Therapeutic compounds |
| CN114623246A (en) * | 2021-12-24 | 2022-06-14 | 浙江国泰萧星密封材料股份有限公司 | Sealing gasket special for triple eccentric butterfly valve and manufacturing method thereof |
-
1991
- 1991-07-10 JP JP16984091A patent/JPH0517737A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004083690A1 (en) | 2003-03-17 | 2004-09-30 | Nippon Leakless Industry Co. Ltd. | Metal gasket for cylinder head |
| JP2007016976A (en) * | 2005-07-11 | 2007-01-25 | Uchiyama Mfg Corp | Gasket material and method of manufacturing gasket material |
| JP2016172750A (en) * | 2009-05-05 | 2016-09-29 | ユニバーシティ オブ フロリダ リサーチ ファウンデーション，インコーポレイテッド | Therapeutic compounds |
| US10017458B2 (en) | 2009-05-05 | 2018-07-10 | University Of Florida Research Foundation, Incorporated | Therapeutic tetrahydronaphthalene compounds |
| CN114623246A (en) * | 2021-12-24 | 2022-06-14 | 浙江国泰萧星密封材料股份有限公司 | Sealing gasket special for triple eccentric butterfly valve and manufacturing method thereof |
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